Cutting-bit.



J. OLSEN.

CUTTING BIT.

APPLICATION rum) 11.22, 1913.

1,081,859. Patented Dec. 16, 1913.

ammo a Joyen Olm' JORGEN OLSEN, Q1? TOTTENVILLE, NEW YORK.

CUTTING-BIT.

LQSLSSQ.

To all whom it may concern:

Iie it known that I, Joanna Onsnx, a citiz'. a1 of Norway, residing at Tottenville, in the county of Richmond and State of New York, have invented new and useful Improvements in Cuttingliits, of which the following is a specification.

This invention relates to improvements in cutting bits and has particular application to what may be termed a compass bit.

In carrying out the present invention, it is my purpose to provide a cutting bit whereby cylindrical blocks or disks may be cut from wood, leather and other materials and which will be constructed in such manner that blocks and disks of various diameters may be cut.

it is also my purpose to provide a cutting bit wherein the cutting blade or knife will be rotatable about a center or axis so that a solid block or disk may be cut out or formed.

Furthermore, I aim to provide a device of the class described which will embrace the desired features of simplicity, e'tliciency and durability and which may be readily applied to any type of bit stock or brace so that the cutter may be manipulated.

\Vith the above and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claim.

In the accompanying drawing: Figure 1 is a view in elevation of a cutting bit constructed in accordance with my present invention. Fig. 2 is a fragmentary longitudinal sectional view through the shank of the bit, and Fig. 3 is a detail perspective View of the cutter.

Referring now to the accompanying drawing in detail, the numeral 1 designates a shank constructed of metal or other suitable material and having one end thereof squared or otherwise formed to provide a plug 2 adapted to engage the socket of a brace. Formed in the shank 1 is a longitudinal bore 3 opening onto the free end of the shank, and slidably mounted within such here is a center punch t. This center punch is of the interchangeable type and has one extremity thereof formed to provide a relatively long tapering point 5, while the opposite end is equipped with a short point 6. Formed on the lower extremity of the shank 1 is a laterally extending lug 7 formed to Specification of Letters Patent.

Application filed April 22 provide a channel 8 intersecting the lower extremity of the bore 3 at right angles to the latter, while the main body portion of the center punch f is cut out adjacent to the opposite ends thereof to form flat surfaces 9, 9 each adapted to lie flush with the lower wall of the channel 8 when the center punch is mounted within the bore. A. coiled expansion spring 10 is secured to the end wall of the bore 3 and acts normally to hold the center punch projected from the lower end of the bore.

The numeral 11 designates the cutting bit as an entirety, such bit including an arm 19. designed to seat within the channel 8 and formed with an elongated slot 13 through which is passed a set screw 14 threadcdly engaging an aperture in the lower wall of the channel 8. lly means of this construction, it will be seen that the arm 12 may be adjusted within the channel and held in any desired position, while the inner edge of the arm engages the shoulder formed by the inner end of the respective flat surface 9 on the center punch thereby limiting the outward movement of the center punch under the action of the spring 10. Suitably secured to and dcpemling from one end of the arm '12 is a cutter blade 15 having a cutting edge '16 and the lower end thereof bifurcated to form cutters 17 spaced apart and designed to enter the material previously to the edge 16 so as to initiate the cutting operation.

From the foregoing description taken in connection with the accompanying drawing, the construction, mode of operation and manner of employing my invention will be readily apparent.

\Vhen it is desired to cut a circular block from a piece of wood, or a disk from leather, or other material, the plug 2 is inserted within the socket of a brace and suitably secured therein. The arm 18 is now adjusted within the channel 8 until the cutter is spaced apart from the center punch the desired distance. Subsequent to adjusting the arm, the center punch is engaged with the material and pressure applied to the shank through the medium of the brace thereby moving the center punch inwardly against the action of the spring 10 until the cutters 17 contact with the material. The device is now rotated under the action of the brace and the cutters 17 enter the material to initiate the cutting action, while the cutting edge 16 of the blade 15 subsequently enters the material so as to complete the cutting operation.

It will be seen that I have provided a cutter whereby disks, blocks and the like may be cut out of various materials and wherein the cutter blade proper is moved about an axis or center so as to facilitate the cutting opera- [1011.

While I have herein shown and described one preferred form of my invention by way of illustration, 1 wish it to be understood that I do not limit or confine myself to the precise details of construction herein described and delineated, as modification and variation may be made within the scope of the claim without departing from the spirit of the invention.

I claim:

A. device of the class described comprising a shank having a longitudinal bore formed therein, a lug formed integral With the lower end of said shank and having a channel formed therein intersecting said bore at right angles thereto, a center punch slidably mounted within the bore and having the side thereof cut out to form a flat surface disposed in a plane coincident with that of the lower wall of said channel whereby shoulders are formed upon said punch, means normally forcing said punch outwardly of the bore, an arm slidably disposed within the channel in said lug and adapted to be engaged by the shoulders at the opposite ends of the cut out portion of said punch to limit the movement of the latter, and a cutter carried by the free end of said arm.

In testimony whereof I afiiX my signature in presence of two witnesses.

JOE-GEN OLSEN. lVitnesses ROBERT HENRY HAs'rWELL, ELEF AANENSEN.

Copies of this patent may lie-obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

